Asked whether he planned to dispute the test, Gordon said: "I'm going to have to find out about that later. You need to call Drew." Gordon then hung up the phone.

Rosenhaus declined to comment on the specifics of the matter.

A spokesman for the NFL Players Association declined to comment.

Last season, Gordon led the NFL with 1,646 receiving yards and became the first player with consecutive 200-yard receiving games. He had 87 receptions and had nine touchdowns with the Browns last season.